Add pg_audit, an auditing extension

This extension provides detailed logging classes, ability to control
logging at a per-object level, and includes fully-qualified object
names for logged statements (DML and DDL) in independent fields of the
log output.

Authors: Ian Barwick, Abhijit Menon-Sen, David Steele
Reviews by: Robert Haas, Tatsuo Ishii, Sawada Masahiko, Fujii Masao,
Simon Riggs

Discussion with: Josh Berkus, Jaime Casanova, Peter Eisentraut,
David Fetter, Yeb Havinga, Alvaro Herrera, Petr Jelinek, Tom Lane,
MauMau, Bruce Momjian, Jim Nasby, Michael Paquier,
Fabrízio de Royes Mello, Neil Tiffin

Author: sfrost

contrib/Makefile

@@ -28,6 +28,7 @@ SUBDIRS = \
 		oid2name	\
 		pageinspect	\
 		passwordcheck	\
+		pg_audit	\
 		pg_buffercache	\
 		pg_freespacemap \
 		pg_prewarm	\

contrib/pg_audit/.gitignore

@@ -0,0 +1,5 @@
+log/
+results/
+tmp_check/
+regression.diffs
+regression.out

contrib/pg_audit/Makefile

@@ -0,0 +1,21 @@
+# pg_audit/Makefile
+
+MODULE = pg_audit
+MODULE_big = pg_audit
+OBJS = pg_audit.o
+
+EXTENSION = pg_audit
+REGRESS = pg_audit
+REGRESS_OPTS = --temp-config=$(top_srcdir)/contrib/pg_audit/pg_audit.conf
+DATA = pg_audit--1.0.0.sql
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = contrib/pg_audit
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif